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- W4298325826 abstract "In this study, Cr 3 C 2 -NiCr coatings of two different particle sizes (fine: 10–30 and coarse: 15–45 μm) were deposited by variable nozzle lengths (long, medium and short) and profiles (convergent-divergent, over-expanding and straight barrel) using high-velocity air-fuel (HVAF) and oxygen augmented air-fuel (HVAF(O)) spray mode. A comparative analysis of the generated coating specimen was performed through the microstructural features, phases present, properties and erosion performance. Additionally, the deposition efficiency (DE) was evaluated to assess the techno-economic feasibility of HVAF/HVAF(O) sprayed Cr 3 C 2 -NiCr coatings. All the deposited coatings were dense, uniform and displayed a homogenous distribution of carbides . The convergent-divergent-based long and medium nozzle sprayed coatings displayed better mechanical properties , whereas coatings deposited by short-length nozzles showed relatively inferior properties. In terms of particle size, fine Cr 3 C 2 -NiCr sprayed using HVAF and coarse Cr 3 C 2 -NiCr sprayed using HVAF(O) displayed improved coating characteristics and properties. Erosive studies implied coatings with improved intersplat adhesion exhibited ductile eroding behavior like “ploughing” and “micro-cutting” rather than “splat flaking/chipping.” Overall, employing a medium-length, convergent-divergent nozzle deposited Cr 3 C 2 -NiCr coatings with an ideal combination of DE, mechanical properties and erosion performance. Besides, short-length nozzles were inappropriate for spraying Cr 3 C 2 -NiCr since they displayed compromised coating characteristics and performance. • HVAF(O) spray allows the deposition of coarser particles at a considerable rate. • Convergent-divergent medium/long nozzle deposits coating with superior properties. • Correct choice of combustion mode-particle size, deposits preferable microstructure. • Under erosive conditions, coatings showed a lower wear rate (45 %) than boiler steel." @default.
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- W4298325826 date "2022-11-01" @default.
- W4298325826 modified "2023-10-13" @default.
- W4298325826 title "Role of process parameters on microstructure, mechanical properties and erosion performance of HVAF sprayed Cr3C2-NiCr coatings" @default.
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- W4298325826 doi "https://doi.org/10.1016/j.surfcoat.2022.128941" @default.
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